Last-turning lathe



' 3 Sheets-Sheet 1.

(N0 Model.) P. B. GILMAN.

LAST TURNING LATHE.

Patented Feb. 16,1892.

' WITNESSES iwim 5W 4 eah/M ATTORNEY.

m: mums PETERS 2a., mcn'omno msnmorou, a. c.

(No Model.) 3 Sheets-Sheet 2.

F. B.-GILMAN.

LAST TURNING LATHE.

No. 469,084. Patented Feb. 16, 1892.

(No Model.) 3 Sheets-Sheet 3.

F. B. GILMAN.

LAST TURNING LATHE. No. 469,084. Patented Feb. 16, 1892.

UNITE ATENT OFFICE.

FARLEY n. GILMAN, OFSPRINGFIELD, VERMONT.

LAST-TURNING LATHE.

SPECIFICATION forming part of Letters Patent No. 469,084, dated February16, 1892.

Application filed January 22, 1891. Serial No. 378,662. (No model.)

To all whom it may concern:

Be it known that I, FARLEY B. GILMAN, a citizen of the United States,residingatSpri n gfield, in the county of Windsor and State of Vermont,have invented certain new and useful Improvements in Last-TurningLathes, of which the following is a specification. I

This invention relates to last-machines, and particularly to anautomatic mechanism operated by the universal power of a lathe forturning lasts and other irregular forms.

The object of the invention is to provide a last-lathe with an automaticmechanism operated by the universal power of the lathe, so as to cause aquick return of the lathe-carriage to thestarting-point of turning thelast.

A further object of the invention is to pro vide a last-turning lathewith an automatic mechanism which will operate the lathe-carriage of itsown accord, while the operator is' changing the lasts, so as to insure aquick return of the carriage to its starting place and save the time andlabor usually spent by the operator in having to change the work andset-the carriage separately.

Astill further object of the invention is to provide a last-turninglathe with an automatic mechanism for the purpose of returning thecarriage, and therefore the cuttingtools to their starting-point, and tocause the return motion of the carriage to stop just a sufficientdistance beyond the heel of the last to insure the proper space in whichto start anothercutwithouttheoperatorsassistancethat is, without itbeing necessary for the oporator to watch the return of the carriage andchange its return mechanism to feed the tool for the next cut.

The invention consists in the novel arrangement and construction ofparts, as will be hereinafter more fully described and claimed.

In the accompanying drawings forming part of this specification, Figure1 is a side elevation of a last-turning lathe with myimprovedcarriage-return mechanism in its normal position. Fig. 2 is a top viewthereof, showing in dotted lines the position of the operating-le verwhen the mechanism is in operation. Fig. 3 is a cross-section taken onthe line a: of Fig. 1. Fig. at is a perspective view of the oscillatingsleeve, showing its U-shaped pro- 'jection on one side and twojournal-bearing projections on the opposite side. Fig. 5 is aperspective view of the front arm having a pivot-bearing and alsoabearing for the oscillating sleeve. Fig. 6 is a side elevation "of asimilar rear arm provided with a bracketjournal for the worm-shaft, andFig. 7 is a side elevation of the bell-crank lever engaged with theoperating-lever. Fig. 8 is afront view of a last-turning lathe with mycarriage-returning device attached thereto. Fig. 9 is an end view of therear arm H. Fig. 10 is an enlarged side elevation of the front of alathe, showing the feed mechanism. Fig. 11 is a top view of part of suchmechanism; and Fig. 12 is a detached view of the sliding. box.

The same letters of reference-denote the same parts throughout theseveral figures of the drawings.

To the front sill A of a last-turning lathe, which is supported bysuitable standards or legs a, (shown broken in the drawings,) is se-'cured by a pivot B the lever 0, having the end of a connecting-link Dpivoted at b, the forward movement of said lever being controlled by apin or projection c on the sill A and the backward movement iscontrolled by i a coil-spring E, secured at one end to the lever 0 andat the other end to the sill A. The forward endof the connecting-link Dis pivoted in a U-shaped projection 01 on the sleeve F. This sleeve isprovided with two projections-e and f, located on the opposite sidethereof from the U-shaped projection d. The projectionsc and fiandthereby the sleeve F, is supported by an arm G, bolted to the front ofthe sill A, and a like arm H, bolted to the rear of the said sill. Thearm G has a pivot-bearing g to receive the pivot g of the projection fand the arm H has a like pivotbearing h to receive the pivot h of theprojection e. The arms G and II have cut-outs which form bearings G andH, respectively, fio receive the sleeve F, and such cuts are of the samecurvature as the said sleeve. Into the sleeve F is closely fitted theshaft I, so as to turn freely therein, which is provided on its frontend with a small gear-wheel J which meshes into a large gear-wheel K onthe front of the lathe. On the rear end of the said shaft Iis securedworm-gear c, which meshes with a worm 7c on the worm-shaft L, one end ofwhich is supported and j ournaled in a. bracket journal-bearing Z, whilethe other end is supported by the piece Z, secured to one of thestandards or legs a. This worm-shaft L also carries a driving-pulley M,through which motive power is imparted to the above-mentioned gearing bya suitable belt from the pulley N on the drum-shaft m.

represents a bell-crank lever pivoted at at between the side of thesillA and a shoe 0. The short arm P of the lever 0 extends out from thepivot n parallel to the sill A and rests on the top of. the lever O. Thelong arm 19 of the lever 0 extends upward from the sill A over. aslotted bar Q, which is secured tothe lathe-carriage B and is providedwith a stop projection q, adj ustably attached to the bar Q by aset-screw q. The shoe 0 is pro vided with a plate-spring R, the free endof which bears against the long arm 19 of the crank-leVer and keeps itin its normal position.

T represents a worm-gear which meshes into the gear-wheel K and islocated upon the shaft t. This is the ordinary feed mechanism asemployed upon last-turning lathes. One end of the shaft t is journaledin the sliding box T, which is given an upward and downward movement bythe connection U, the hook-rod U having the notch u, the slide to,engaging the notch u, the curved spring V, and the usual lathe-carriagestop 0.

A is a sliding bar located upon the top of the sill A and to Which theslide to is secured or formed in the same piece therewith.

The operation of this automatic mechanism is as follows: The extent ofthe desired out on a last is determined and the stop projection q is seton the slotted bar Qby the set-screw q, so as to come in contact withthe long arm 29 of the bell-crank lever 0 immediately upon such cutbeing finished. The shaft of the wheel K has a gear-wheel A upon itsrear end, which meshes with a larger gear-wheel A secured upon theinside of the rear sill, so as to mesh with the rack-bar A of thelathecarriage B, as'shown by dotted linesin Figsl and 8. The workmanpresses down the lever U, which raises the box T and the worm T, so thatit will engage the wheel K to feed the carriage to the left, asindicated bythe arrow in Figs. 8 and 10, to make the cut onthe last, andwhen it is fed in this direction so far as to strike the stop 1; the cutis finished, and bythe carriage engaging the said stop the sliding bar Ais moved in the direction indicated by the said arrows, carrying theslide a with it, so that the said slide a disengages the notch u,allowing the box T, with the worm T, to drop down to the position shownin dotted lines in Figs. 10 and 12, disengaging the wheel K and leavingthe carriage free to be operated by means of the wheel J, (which isrevolved in the opposite direction from the worm T by means of the wormIt and wormgear 2,) meshing with the said wheel K, so as to return thecarriage to its starting-point. The wheel Ki's therefore alternatelyengaged by the worm T and by the gear J.. It will be observed that thefeed on the out having lines, Fig. 2, which allows the short arm P ofthe bell-crank lever O, which has been resting on top of the lever Cwhile the cut wasin progress, to fall down behind the lever C by.

the pressure of the spring R on the long arm The act of pushing thelever G into the position shown in dotted lines also causes theconnecting-link D and the sleeve F to be moved, which carries the shaftI, having the gear-wheel J, into its bearings G and H in the arms Gand Hand the gear-wheel J to mesh with the gear-wheel .K, giving the carriage a quick return to its starting-point. The short arm P of thebell-crank lever Oremains in the position shown in Fig. 7 until thelathe-carriage has been returned to its starting-point, and as soon asthe carriage has reached such point the stop q strikes the long arm p ofthe bell-crank lever and throws it back, allowing the several parts toassume their normal position and rendering the carriage in properposition for the lathe to commence another cut.

I do not Wish to be understood as limiting myself to the construction ofthe parts and the manner of connecting them to a machine for turninglasts and other like forms, as is herein described, but reserve tomyself the exclusive right to alter the position of said parts to eachother as well as their construction, so as to produce a machine of thecharacter described without departing from the spirit of my invention.

Having thus describedm y invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination, with a last-turnin g lathe, its feed mechanism, andits carriage provided with a stop, of a trip mechanism consisting of abell-crank lever, the platespring, the lever C, and the coil-spring, andconnections with said feed mechanism, whereby the latter is stopped soas to leave the carriage free to be returned to its starting point,substantially as set forth.

2. The combination, with the trip mechanism and the feed mechanism, of aconnected mechanism consisting of the oscillating sleeve containing theshaft provided with two gearwheels, and the link secured to the sleeveand to the operating-lever of the said trip mechanism, and connectionswith said feed mechanism whereby the latter is operated, substantiallyas and for the purpose set forth.

3. In a last-turning lathe, the trip mechanism, the feed mechanism, andthe connected mechanism comprising the oscillating sleeve provided withpivots, the shaft located in the sleeve and provided with twogear-wheels, and the link secured to the sleeve and to theopcrating-lever of the said trip mechanism, in combination with the armsG and H, each having a cut-out that forms a bearing for the said sleeveand each having a pivot-bearing forlatter is stopped, so as to leave thecarriage free to be returned to its starting-point, substantially as setforth.

5. The combination, with a last-turning lathe, of the trip mechanism,the gear-wheel K and the pinion A located upon the same 25 shaft, theadjustable worm, the gear-wheel J, the oscillating sleeve, and the linkD, the said wheel K to be alternately engaged by the said worm and wheelJ, substantially as shown and described, and for the purpose set 30forth.

6. In a last-turning lathe, the combination of the adjustable worm ofthe oscillating sleeve, the shaft jo'urnaled in the sleeve and providedwith the gear-wheel J, the gear-wheel K, located between the adjustableworm and the gear-wheel J, so as to be alternately engaged by the Wormand the gear wheel J, with the trip mechanism and the rod D, connectingthe trip mechanism with the oscillating sleeve, 40 substantially as andfor the purpose set forth.

In witness whereof I hereunto set my hand in the presence of twowitnesses,

FARLEY B. GILMAN.

Witnesses:

FREDERICK V. A. TowNsnNn, A. vM. ALLBE.

